The Science Thread

[Dona Ferentes]

Based on stats from
https://planet4589.org/space/con/star/stats.html…
the mass of Starlink satellites in orbit is over 2600 tons - almost 6 times the mass of the ISS - and it is growing quickly.

 

[SirRumpole]

What future robots may look like.

 

[sptrawler]

I don't know if this is accurate, but it is where the aero industry is heading.

China's New 12,000mph Engine Could Slash 20-Hour Flights To 50 Minutes

Recent advancements in aircraft engine technology have been more than impressive, especially with innovations like the Supersonic Hydrogen Jet That Could

www.dmarge.com

 

[SirRumpole]

I don't know if this is accurate, but it is where the aero industry is heading.

China's New 12,000mph Engine Could Slash 20-Hour Flights To 50 Minutes

Recent advancements in aircraft engine technology have been more than impressive, especially with innovations like the Supersonic Hydrogen Jet That Could

www.dmarge.com

A thrill and a shudder.

The military applications are obvious.

 

[mullokintyre]

I don't know if this is accurate, but it is where the aero industry is heading.

China's New 12,000mph Engine Could Slash 20-Hour Flights To 50 Minutes

Recent advancements in aircraft engine technology have been more than impressive, especially with innovations like the Supersonic Hydrogen Jet That Could

www.dmarge.com

The bottom line is, how much fuel does it need to make that 50 minute flight at hypersonic speeds?
At the rarified atmospherrc heights are they relying on mainly thrust to keep them at height?
The lift they would get from the airflow would be miniscule.
At those heights you start to get into the graveyard area where stall speed approaches cruise speed.
Ok for military use where a pilot and co pilot can eject.
Not much use for carrying passengers.
Mick

 

[qldfrog]

The bottom line is, how much fuel does it need to make that 50 minute flight at hypersonic speeds?
At the rarified atmospherrc heights are they relying on mainly thrust to keep them at height?
The lift they would get from the airflow would be miniscule.
At those heights you start to get into the graveyard area where stall speed approaches cruise speed.
Ok for military use where a pilot and co pilot can eject.
Not much use for carrying passengers.
Mick

I think for these flights altitudes, you do it more like a ballistic missile than an actual flying plane, do not need lift

 

[mullokintyre]

I think for these flights altitudes, you do it more like a ballistic missile than an actual flying plane, do not need lift

the problem is, you need slow flight to takeoff and climb to intermediate levels.
Ballistic speeds and the acceleration create G forces that would kill us mere mortals.
Mick

 

[qldfrog]

the problem is, you need slow flight to takeoff and climb to intermediate levels.
Ballistic speeds and the acceleration create G forces that would kill us mere mortals.
Mick

True unless you have more like a rocket start, or variable wings, scram jets, etc the work for the engineers.
But we both agree..h2 pathetic energy density makes it unlikely but for shorter flight..
Or kamikase mission strapped to nitrogen cooled super high pressure brittle leaky tanks .can not wait

 

[dyna]

For a sure - fire cockroach whacking technique , tune in to the last 5 minutes of yesterday 's " Dr. Karl's Triple J podcast " ( 22 nd August ) Yes , it 's all based on science , too . Believe it or not !

 

[basilio]

I don't know if this is accurate, but it is where the aero industry is heading.

China's New 12,000mph Engine Could Slash 20-Hour Flights To 50 Minutes

Recent advancements in aircraft engine technology have been more than impressive, especially with innovations like the Supersonic Hydrogen Jet That Could

www.dmarge.com

I came across this report from a US research group in 2021. Appears to be an identical process. Interesting to see how they are progressing.

New Propulsion System Could Enable Flying at Speeds Up to Mach 17

The UCF-developed propulsion system could allow for flight speeds of Mach 6 to 17 (more than 4,600 to 13,000 miles per hour) and would have applications in air and space travel. University of Central Florida researchers are building on their technology that could pave the way for hypersonic fligh

scitechdaily.com

 

[mullokintyre]

Another fine example of where the consensus held back new discoveries .
Especially when the discoveries were put forward by a woman..
Mick

 

[SirRumpole]

The so far fruitless search for dark matter.

What a bunch of WIMPS.

The world's most sensitive detector has found no sign of dark matter. So where is it?

Scientists have yet to find evidence of WIMPs — one of the main contenders for dark matter — in the most sensitive test yet made. We explain what the new results mean.

www.abc.net.au

 

[mullokintyre]

The so far fruitless search for dark matter.

What a bunch of WIMPS.

The world's most sensitive detector has found no sign of dark matter. So where is it?

Scientists have yet to find evidence of WIMPs — one of the main contenders for dark matter — in the most sensitive test yet made. We explain what the new results mean.

www.abc.net.au

They are looking in all the wrong places.
I would be heading straight for Mar-A-Largo.
After all, trump has stolen everything else.
Mick

 

[mullokintyre]

The so far fruitless search for dark matter.
What a bunch of WIMPS.

The world's most sensitive detector has found no sign of dark matter. So where is it?

Scientists have yet to find evidence of WIMPs — one of the main contenders for dark matter — in the most sensitive test yet made. We explain what the new results mean.

www.abc.net.au

Actually, it once again highlights that "The Science" is never ever settled.
Dark matter was invented as a way of providing something that would tie in all the loose ends that cannot be explained via Einsteins theory of Relativity or the Standard Model of particle Physics.
It is equally possible that the concept of dark matter is a fools dream, just like the 19th century theory of a Luminiferous Aether that would explain the motions of the planets among other things.
Sir Isaac Newtons , brilliant thinker and scientist that he was, was a strong supporter of the theory of the Aether.
James Maxwell was also a big fan of the Aether theory to help overcpme some observable data anamolies.
It was Einsteins Theory of Relativity that effectively killed off the Luminiferous Aaether theory.
Perhaps its time to quietly send dark matter to the same round bin.
There are plenty of scientists who are looking for something other than dark matter to explain those pesky data points that point to failures in the theory.

Mick

 

[Knobby22]

Actually, it once again highlights that "The Science" is never ever settled.
Dark matter was invented as a way of providing something that would tie in all the loose ends that cannot be explained via Einsteins theory of Relativity or the Standard Model of particle Physics.
It is equally possible that the concept of dark matter is a fools dream, just like the 19th century theory of a Luminiferous Aether that would explain the motions of the motions of the planets among oyher things.
Sir Isaac Newtons , brilliant thinker and scientist that he was, was a strong supporter of the theory of the Aether.
James Maxwell was also a big fan of the Aether theory to help overcpme some observable data anamolies.
It was Einsteins Theory of Relativity that effectively killed off the Luminiferous Aaether theory.
Perhaps its time to quietly send dark matter to the same round bin.
There are plenty of scientists who are looking for something other than dark matter to explain those pesky data points that point to failures in the theory.

Mick

Dark matter and dark energy, not observable.
100% with you. I reckon something is being missed.

 

[SirRumpole]

Why it's so hard to land on the moon.

 

[sptrawler]

India, China, Russia to jointly build massive nuclear power plant on moon to establish a future human lunar colony

India and China are collaborating with Russia to establish a nuclear power plant on the Moon. This project, led by Russia's Rosatom, aims to generate up to half a megawatt of energy to support lunar base operations. Indias involvement aligns with its plans for a manned lunar mission by 2040. The...

m.economictimes.com

 

[qldfrog]

China-developed photovoltaic nuclear battery could run for centuries: scientists | South China Morning Post https://www.scmp.com/news/china/sci...uclear-battery-could-run-centuries-scientists
I like the concept:
In layman's terms,a "solar" panel wrapped around a mini source of nuclear isotopes catching alpha rays instead of sun rays: 24/7 for centuries...
Imagine these batteries in satellites, outer space, underground or under sea for sensors, or in pacemakers/body sensors for life ...
They will keep kicking in the coffins for centuries after your death too
Talk about leaving a legacy

 

[mullokintyre]

An interesting development in IC design sees techos at MIT create thin film 3D printed IC's that do not rely on semiconductors.
Looks great in theory, just need to see how the application goes in mass produced cheap devices.
Mick

 

[dyna]

From yesterday ( 24 th October ) Dr. Karl's JJJ podcast : a crack in an 1898 dead Kenyan Tsavo region lion's tooth from Chicago's natural history museum has revealed ....guess what ? Human DNA !
More to the story on-line , too .